Assessment of the complex effects of fisheries and hydrological conditions in Kamchatsky Gulf on formation of Pacific salmon spawning stocks in Kamchatka River-Reference-Cited by-同舟云学术

Assessment of the complex effects of fisheries and hydrological conditions in Kamchatsky Gulf on formation of Pacific salmon spawning stocks in Kamchatka River

Published:2023-02-03 Issue:66 Volume: Page:5-51
ISSN:2782-6236
Container-title:The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean
language:
Short-container-title:Issledovaniâ vodnyh biologičeskih resursov Kamčatki i Severo-Zapadnoj časti Tihogo okeana

Author:

Bugaev A. V.¹,Zikunova O. V.¹,Tepnin O. B.¹,Shubkin S. V.¹,Koval M. V.¹,Soshin A. V.¹,Fadeev E. S.¹,Artyukhina N. B.¹,Malykh K. M.¹

Affiliation:

1. Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (KamchatNIRO)

Abstract

The paper represents results of longterm analysis of the state of the Pacific salmon stocks in Kamchatka River. It is admitted, that high-level effects of fisheries resulted in degradation of the spawning stock (stock abundance) of major local salmon stock units in the basin of Kamchatka River. Commercial importance and previous reproduction potential of all Pacific salmon species has been lost in the mediate and upper parts of the river. This situation was especially noticable in 2018–2020.In view of the trend in the dynamics of salmon stocks in the Kamchatka scientists of KamchatNIRO suggested additional measures of fishery regulation in the Kamchatsky Gulf and Kamchatka River basin. A target strategy of management of fishing Pacific salmon in Kamchatka River was developed as a result, including a complex of limitations to start fishing (catches), a system of stop-fishing days and periods of full stop fishing to provide escapement for spawning.Moreover, regular annual biological monitoring of Pacific salmon of Kamchatka River, provided by KamchatNIRO, was noticeably strengthened with additional hydroacoustic counting and control fishing at the fishery plot № 832. Hydrological-hydroacoustic surveys in Kamchatka Gulf began in 2018 also were to improve the regional scientific monitoring.Results of the surveys 2019–2021 allowed to evaluate current effects of hydrological regime and fishing in Kamchatka Gulf on formation of salmon spawning stocks in Kamchatka River. It has been found, that the changes of the morphodynamics of the Kamchatka River mouth in 2021 resulted in wider area of freshwater effects in Kamchatka Gulf. That was a trigger of redistribution of prespawning salmon aggregations on their migration routs to the river mouth, what eased press of fishing in the area of plots of marine fixed gill nets. In this way the spawning escapement of Pacific salmon into the basin of Kamchatka River this year increased.

Publisher

Kamchatka Research Institute of Fisheries and Oceanography

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Cited by 2 articles. 订阅此论文施引文献订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献

1. Analytical review of the results of salmon fisheries in Kamchatka Territory in 2018–2022 (fore- casts, fisheries, stocks). Communication 1 (Pink salmon, Chum salmon);The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean;2023-10-24

2. Analytical review of the results of salmon fisheries in Kamchatka Territory in 2018–2022 (forecasts, fisheries, stocks). Сommunication 2 (sockeye salmon, coho salmon, chinook salmon);The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean;2023-10-24